Tyre squeal

Crossy · 10 Jun 2008 at 09:21

what causes it. For example, turning hard around a roundabout and the tyres squeal.

NathanE · 10 Jun 2008 at 09:23

Hard tyres isn't it? How old are your tyres?

Crossy · 10 Jun 2008 at 09:34

NathanE said:
Hard tyres isn't it? How old are your tyres?

No idea. They've all got around 3-4mm left on the tread if that helps.

paradigm · 10 Jun 2008 at 09:38

Can just be the surface in all honesty.

The local Sainsbury's carpark is impossible to turn on (even at 5MPH) without tyre squeal.

jamoor · 10 Jun 2008 at 10:13

I have toyo tyres on my eunos, they squeal like crazy

excaliborg · 10 Jun 2008 at 10:14

My Michelins squeal if I corner fast on most surfaces!

InvaderGIR · 10 Jun 2008 at 10:23

I've always found hard/fast cornering to squeal most tyres. As far as I knew it was the weight being pushed onto the sidewall as you go round, causing it to squeal.

InvG

Jonnycoupe · 10 Jun 2008 at 10:32

Slip angles.

If it does it frequently maybe your tracking is out.

ConTRo13R · 10 Jun 2008 at 10:34

when u turn say left the right tyre will rub against the wheel arches as its spinning and the left slightly slip on the road as it spinning around faster over a shorter distance, whereas the outside tyre will keep its speed as it has a longer route around.

tyre compund does play a role here too

excaliborg · 10 Jun 2008 at 10:37

ConTRo13R said:
when u turn say left the right tyre will rub against the wheel arches as its spinning and the left slightly slip on the road as it spinning around faster over a shorter distance, whereas the outside tyre will keep its speed as it has a longer route around.

tyre compund does play a role here too

Does your car not have a diff?

ConTRo13R · 10 Jun 2008 at 10:41

excaliborg said:
Does your car not have a diff?

nope, tis one i use for stock racing

Entai · 10 Jun 2008 at 10:55

Yes compound plays a part, but the main thing that creates squeal is the shape and size of the tread blocks cut iinto the tyre, as they slip slightly against the road surface the tread blocks will vibrate against each other slightly and that causes tyre squeal.

You will not hear tyre squeal on slick racing tyres as they have no tread blocks to vibrate.

ConTRo13R · 10 Jun 2008 at 10:56

Entai said:
Yes compound plays a part, but the main thing that creates squeal is the shape and size of the tread blocks cut iinto the tyre, as they slip slightly against the road surface the tread blocks will vibrate against each other slightly and that causes tyre squeal.

You will not hear tyre squeal on slick racing tyres as they have no tread blocks to vibrate.

aint slicks been banned? unles they have tread?

Hawk Tuah · 10 Jun 2008 at 10:59

They squeal for the same reason you can make your trainers squeal against a hard floor.

It happens most on a smooth shiny road surface. The rubber is skidding across a hard surface and it creates a resonance in the rubber. The same as pulling a bow over a string, only more violent.

Entai · 10 Jun 2008 at 11:00

ConTRo13R said:
aint slicks been banned? unles they have tread?

In F1 yes slicks are banned (for the moment, they may be back next year though!!) .
Other forms of racing do allow slick tyres though.

I was just making the point that ONLY tyres with a tread pattern on them will squeal, slick tyres cannot squeal in the same way.

ConTRo13R · 10 Jun 2008 at 11:02

yea i thought they were! lol back next year i hear u cry! now this could be interesting

Clarkey · 10 Jun 2008 at 11:11

Probably won't be much different to the grooved ones they have now tbh. AFAIK just about every other racing series use full slicks, god knows why they were banned in F1 which is supposed to be the pinnacle of motorsport.

If it's caused by the tread blocks though, how do you explain why it happens so much more on certain surfaced though? For example, Pen Rd. McDonalds carpark squeals like hell, and there is one small roundabout which generates massive squeal (begs you to go faster in other words

)

Hawk Tuah · 10 Jun 2008 at 11:19

Clarkey said:
If it's caused by the tread blocks though, how do you explain why it happens so much more on certain surfaced though? For example, Pen Rd. McDonalds carpark squeals like hell, and there is one small roundabout which generates massive squeal (begs you to go faster in other words )

Very smooth shiny tarmac. Without bumpy bits to grip to.

Simon · 10 Jun 2008 at 11:20

Bug One said:
They squeal for the same reason you can make your trainers squeal against a hard floor.

It happens most on a smooth shiny road surface. The rubber is skidding across a hard surface and it creates a resonance in the rubber. The same as pulling a bow over a string, only more violent.

Due to slip angles, as suggested...

Entai · 10 Jun 2008 at 11:24

Clarkey said:
Probably won't be much different to the grooved ones they have now tbh. AFAIK just about every other racing series use full slicks, god knows why they were banned in F1 which is supposed to be the pinnacle of motorsport.

If it's caused by the tread blocks though, how do you explain why it happens so much more on certain surfaced though? For example, Pen Rd. McDonalds carpark squeals like hell, and there is one small roundabout which generates massive squeal (begs you to go faster in other words )

Friction coefficient between the tyres and the road surface.

Different surfaces will make the tyres tread blocks vibrate more than others thus giving more squeal.
Quite often the cheaper the road surface the more squeal, because you also have to remember that while squealing the tyres actually have less grip then when quiet, (not by much in the grand scheme of things but a measurable amount none the less).